1 /* Parser definitions for GDB.
3 Copyright (C) 1986, 1989-2000, 2002, 2007-2012 Free Software
6 Modified from expread.y by the Department of Computer Science at the
7 State University of New York at Buffalo.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #if !defined (PARSER_DEFS_H)
25 #define PARSER_DEFS_H 1
31 extern int parser_debug;
33 extern struct expression *expout;
34 extern int expout_size;
35 extern int expout_ptr;
37 #define parse_gdbarch (expout->gdbarch)
38 #define parse_language (expout->language_defn)
40 /* If this is nonzero, this block is used as the lexical context
43 extern struct block *expression_context_block;
45 /* If expression_context_block is non-zero, then this is the PC within
46 the block that we want to evaluate expressions at. When debugging
47 C or C++ code, we use this to find the exact line we're at, and
48 then look up the macro definitions active at that point. */
49 extern CORE_ADDR expression_context_pc;
51 /* The innermost context required by the stack and register variables
52 we've encountered so far. */
53 extern struct block *innermost_block;
55 /* The block in which the most recently discovered symbol was found.
56 FIXME: Should be declared along with lookup_symbol in symtab.h; is not
57 related specifically to parsing. */
58 extern struct block *block_found;
60 /* Number of arguments seen so far in innermost function call. */
61 extern int arglist_len;
63 /* A string token, either a char-string or bit-string. Char-strings are
64 used, for example, for the names of symbols. */
68 /* Pointer to first byte of char-string or first bit of bit-string. */
70 /* Length of string in bytes for char-string or bits for bit-string. */
76 /* A language-specific type field. */
78 /* Pointer to first byte of char-string or first bit of bit-string. */
80 /* Length of string in bytes for char-string or bits for bit-string. */
87 struct typed_stoken *tokens;
100 int is_a_field_of_this;
103 struct objc_class_str
105 struct stoken stoken;
111 /* For parsing of complicated types.
112 An array should be preceded in the list by the size of the array. */
124 /* The stack can contain either an enum type_pieces or an int. */
127 enum type_pieces piece;
130 extern union type_stack_elt *type_stack;
131 extern int type_stack_depth, type_stack_size;
133 extern void write_exp_elt_opcode (enum exp_opcode);
135 extern void write_exp_elt_sym (struct symbol *);
137 extern void write_exp_elt_longcst (LONGEST);
139 extern void write_exp_elt_dblcst (DOUBLEST);
141 extern void write_exp_elt_decfloatcst (gdb_byte *);
143 extern void write_exp_elt_type (struct type *);
145 extern void write_exp_elt_intern (struct internalvar *);
147 extern void write_exp_string (struct stoken);
149 void write_exp_string_vector (int type, struct stoken_vector *vec);
151 extern void write_exp_bitstring (struct stoken);
153 extern void write_exp_elt_block (struct block *);
155 extern void write_exp_elt_objfile (struct objfile *objfile);
157 extern void write_exp_msymbol (struct minimal_symbol *);
159 extern void write_dollar_variable (struct stoken str);
161 extern void mark_struct_expression (void);
163 extern char *find_template_name_end (char *);
165 extern void start_arglist (void);
167 extern int end_arglist (void);
169 extern char *copy_name (struct stoken);
171 extern void push_type (enum type_pieces);
173 extern void push_type_int (int);
175 extern void push_type_address_space (char *);
177 extern enum type_pieces pop_type (void);
179 extern int pop_type_int (void);
181 extern int length_of_subexp (struct expression *, int);
183 extern int dump_subexp (struct expression *, struct ui_file *, int);
185 extern int dump_subexp_body_standard (struct expression *,
186 struct ui_file *, int);
188 extern void operator_length (const struct expression *, int, int *, int *);
190 extern void operator_length_standard (const struct expression *, int, int *,
193 extern int operator_check_standard (struct expression *exp, int pos,
195 (struct objfile *objfile, void *data),
198 extern char *op_name_standard (enum exp_opcode);
200 extern struct type *follow_types (struct type *);
202 extern void null_post_parser (struct expression **, int);
204 extern int parse_float (const char *p, int len, DOUBLEST *d,
205 const char **suffix);
207 extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
208 DOUBLEST *d, struct type **t);
210 /* During parsing of a C expression, the pointer to the next character
211 is in this variable. */
215 /* After a token has been recognized, this variable points to it.
216 Currently used only for error reporting. */
217 extern char *prev_lexptr;
219 /* Tokens that refer to names do so with explicit pointer and length,
220 so they can share the storage that lexptr is parsing.
222 When it is necessary to pass a name to a function that expects
223 a null-terminated string, the substring is copied out
224 into a block of storage that namecopy points to.
226 namecopy is allocated once, guaranteed big enough, for each parsing. */
228 extern char *namecopy;
230 /* Current depth in parentheses within the expression. */
232 extern int paren_depth;
234 /* Nonzero means stop parsing on first comma (if not within parentheses). */
236 extern int comma_terminates;
238 /* These codes indicate operator precedences for expression printing,
239 least tightly binding first. */
240 /* Adding 1 to a precedence value is done for binary operators,
241 on the operand which is more tightly bound, so that operators
242 of equal precedence within that operand will get parentheses. */
243 /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
244 they are used as the "surrounding precedence" to force
245 various kinds of things to be parenthesized. */
248 PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
249 PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
250 PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
251 PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
254 /* Table mapping opcodes into strings for printing operators
255 and precedences of the operators. */
260 enum exp_opcode opcode;
261 /* Precedence of operator. These values are used only by comparisons. */
262 enum precedence precedence;
264 /* For a binary operator: 1 iff right associate.
265 For a unary operator: 1 iff postfix. */
269 /* Information needed to print, prefixify, and evaluate expressions for
272 struct exp_descriptor
274 /* Print subexpression. */
275 void (*print_subexp) (struct expression *, int *, struct ui_file *,
278 /* Returns number of exp_elements needed to represent an operator and
279 the number of subexpressions it takes. */
280 void (*operator_length) (const struct expression*, int, int*, int *);
282 /* Call TYPE_FUNC and OBJFILE_FUNC for any TYPE and OBJFILE found being
283 referenced by the single operator of EXP at position POS. Operator
284 parameters are located at positive (POS + number) offsets in EXP.
285 The functions should never be called with NULL TYPE or NULL OBJFILE.
286 Functions should get passed an arbitrary caller supplied DATA pointer.
287 If any of the functions returns non-zero value then (any other) non-zero
288 value should be immediately returned to the caller. Otherwise zero
289 should be returned. */
290 int (*operator_check) (struct expression *exp, int pos,
291 int (*objfile_func) (struct objfile *objfile,
295 /* Name of this operator for dumping purposes. */
296 char *(*op_name) (enum exp_opcode);
298 /* Dump the rest of this (prefix) expression after the operator
299 itself has been printed. See dump_subexp_body_standard in
301 int (*dump_subexp_body) (struct expression *, struct ui_file *, int);
303 /* Evaluate an expression. */
304 struct value *(*evaluate_exp) (struct type *, struct expression *,
309 /* Default descriptor containing standard definitions of all
311 extern const struct exp_descriptor exp_descriptor_standard;
313 /* Functions used by language-specific extended operators to (recursively)
314 print/dump subexpressions. */
316 extern void print_subexp (struct expression *, int *, struct ui_file *,
319 extern void print_subexp_standard (struct expression *, int *,
320 struct ui_file *, enum precedence);
322 /* Function used to avoid direct calls to fprintf
323 in the code generated by the bison parser. */
325 extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);
327 extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);
329 #endif /* PARSER_DEFS_H */